import java.sql.*;

public class DBTest {
    public static void main(String[] args) {
        // 1. 数据库连接信息 (URL, 用户名, 密码)
        String url = "jdbc:mysql://localhost:3306/library_management?useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true";
        String username = "root"; // 你的数据库用户名
        String password = "hu050730"; // 你的数据库密码

        Connection conn=null;
        PreparedStatement prep=null;
        ResultSet rs=null;

        String name="admin";
        String pass="admin123";
        int id=0;
        String email=null;


        String sql = "select * from user where username= ? and password= ? ";

        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
         conn  = DriverManager.getConnection(url, username, password);

            prep = conn.prepareStatement(sql);
            prep.setString(1,name);
            prep.setString(2,pass);
            rs = prep.executeQuery();
            while (rs.next()) {
                 id = rs.getInt(1);
                 email = rs.getString(6);

            }

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        finally {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            try {
                prep.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }

        }
        System.out.println(id);
        System.out.println(email);
    }
}